The EOSIO Testnet: Block.one's EOSIO Testnet to test EOSIO smart contracts before deploying on production networks.

Block Explorers

Bloks.io: Block explorer with several features across many EOSIO blockchain networks.

EOSX: Explorer and network monitor for multiple EOSIO blockchains, all in one.

EOSIO Plugins

EOSIO Kafka Plugin: This plugin allows you to utilize all of Kafka's rich real-time features for building date pipelines and streaming apps.

Software Development Kits (SDKs)

Zeus SDK: The Zeus SDK offers a number of functionalities including a command line tool, templates, and a package manager.

EOSlime: EOS Javascript development, testing and deployment framework based on eosjs.js. EOSlime could be used as the EOS Javascript SDK. The framework's main purpose is to help developers quickly onboard and start building with confidence.

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